package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * ClassName: RedisIdWorker
 * Package:
 * Description:
 *
 * @Author:xiaohei
 * @Create 2024/5/30 20:46
 * Version 1.0
 */
@Component
public class RedisIdWorker {

    //开始时间戳
    private final long BEGIN_TIMESTAMP = 1704067200L;
    //序列号位数
    private final int COUNT_BITS = 32;
    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix){
        //1 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp =  nowSecond - BEGIN_TIMESTAMP;

        //2  生成序列号
        //2.1  获取当前日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyymmdd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);


        //3 拼起来并返回
        return timeStamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2024, 1, 1, 0, 0, 0);
        long timeEpochSecond = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(timeEpochSecond);
    }

}
